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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd576788c8a8b165ccb262a57794e175041137bfb22b19e259370ad4ac2c954c7' 
  AND token = 'dPUCXiF8mPnVst/X1r646KjIiQIL3/BFXIwjLsX+y7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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