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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a8ed1bbaae83e79579c8f8b2dc5d9601740bf86fa27a01c9a32189c75864b8' 
  AND token = 'B7qaogKn282hExI0ZV/TBOByOxhg2H9B0ARPRGk9KjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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