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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b113483c3c3bc84a0bb319338e32b6bce0430879cdcf92b73ce82a76a0e03ae' 
  AND token = 'xZwzJwZPRyAJRYqYEoBYiMlBxUnQghS4+6m6uWXBoig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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