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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b3dbbce4a4cbd60e65339673ff618310b3ce8f97ef4f2a4af7a3cc1834a8d9' 
  AND token = 'W5VrvXwf350bTLG9F0dEvYqkSKe5PgSx/lhuC1c6Ftw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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