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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aca478bef25793f78581b88735800d3e3ce8d8e67c43bf765c719958c070d75' 
  AND token = '+teFdaZdCA2DhnxpBgyZ9ci3YmMf+0x8Mw1c/2rxl6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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