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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb91018bbc4f80c3f116d37f3d7f7dbb1c5ccf943a4986413a3edae6340a4b0b' 
  AND token = 'vDKFUNwq7p7ykjXprD4x2597HJcz9ffnhwrv4Frs8H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}