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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '448ce03b5c719636782a8d0c80b1eefdcccacf6b5894b04d633249cbdd5d4ae1' 
  AND token = 'OCKt/E/ge70WZV+8RrMgkIqkphRxMPjd/pu1IlohHrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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