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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6663b64a918308b6703c4397c9f9c206037f04c492e1b78e431dabf055188a14' 
  AND token = '9nGBzkK31/b6S20EYazrfAZpiUZ1dSo/7QYt9uLf9sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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