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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ecb7f5df590a24c7144425a1bdfcc711f6a48ffd435c10bf11a81c6576965f' 
  AND token = '4/5GbCDWx+UHOOSoncL5LBwKSrZweT0Xy6eONs5PJo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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