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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e639de0bf7cd93e0f5c9cd065619a4883bfcd87bbc06d9fab91bfd6c26dfd571' 
  AND token = 'JZgOTPbbDXucXaIGL6QbqEarTHacab3b6FT2QQRLeME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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