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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63aeba474d76d9b24e9dbf0c0ae9423c7f6060469244ef6a9151a7ad3db99b83' 
  AND token = 'K2h+41fTbc2CJNZLe5veyPa8ZdL3V5eelQQqTr+sQnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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