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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f923cfd209db58a9e84aabe12e700ce2f3fec5910469430380f8332608b139' 
  AND token = 'Znojx+UWi6CVJ19lWKK0/ScboxKK8LQEzQbgtP5hjxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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