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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18eec3ea20e107454cc19fa460583aa0e1147dba1aa109d88de9c7ce3f571cbb' 
  AND token = '7+R+zGbx0021hFLHTDLx2nfNZfmQY4Wj5lZH36yTxnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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