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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1896b6c5f3eac29bb9eb51f466ac900609a8e456f824dfb16eca126da1989b12' 
  AND token = 'm3baM03oeG7pLNzTBJaIwRiX69+AISM7pIXQ5FPh9UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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