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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711bea0616d14cebf328d47d5e679e719ba8a152915a56dfbeb3db8c288b7ede' 
  AND token = 'f5cawz6APqE+KjyXz5H2eqaWFj3IChzscUKaD5CZKAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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