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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad337b163e17ec61db4d3dc9ed45c93b644cd90a0a01c4bfa12e208465c15555' 
  AND token = '2sxnf11utu9AR5zrqNtbt/dP03G/bV1D6KBBDRiF/8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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