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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7045dbbcfdb76af03bce64571d223ec99e7cd2c14401a05c48ac9610edada7d6' 
  AND token = 'kbSOtuHYllYphmc5TsuVxQ4KnX4y7Gv5msqyorV45ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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