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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a8e62780b212fe27603020aa4ca933e769883d34c3e468956aae75f91c9810' 
  AND token = 'bEvoVDe0jqSuos/F7B0gHQSyHCJT6S/ThaUqt1oayxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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