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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f807c032728a16539fc166466a24b8d47028df07998486fd1d5b8c7b3827b0' 
  AND token = 'sraFoyhoyU6ZcAYSbsTjRTptE7Mn4dOr8UJhH54Qh6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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