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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3565a502dfd52ac442f95cd5533d0c8a251fb10335b35464a4cf83c213eb87c' 
  AND token = '1+M31IzF2IGYZeTaVo7UkSc41U+aD2nkZoScDIsOJjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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