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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee81aa4d669ce726ddf5982eb97cdd71ffd27261eb9113300871b3a3ffd4cff' 
  AND token = 'CIMbQjZJgBwY6t0hojVWgKBS6BeaETDJk8jQf+2Sfxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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