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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b604adbcd9d73fb549eb0521d317b4bc113d7f83b2c90b4a56650f1e3d9ad10' 
  AND token = '5+JXgvovcsklYL05n4IBoiojqsnJlcVNfhSNKHwSoos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00118

JSON explain

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