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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e6f1ac794f6e248eb401c62d8d15ac24b4be25d8d50c324adb1d31afd5a5f6' 
  AND token = 'TjM7MVI5vJksZklcl8RzxQhT0FayOmk5hbZ1ljkm6+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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