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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade2ae40c1479d7c9c4c589544638bfa2e45885f30d9b089835c5cf9f46177fa' 
  AND token = '6z9UnscV9TzlwJLb9uHrprJ6xE9k1zcAwdI+qy0Fgr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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