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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf58ebff9b9a1b11f2bd3b8dec0ec963a7f964fd871f48ae6de0815d3afb0cb8' 
  AND token = '9Q0EtGOpmCBTW74shCBfRwNIY5mypDCwjXpYZAwP+a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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