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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4c783803384fcc3c88c0131e767d14202c157450e3e746c4d47e5f7c7ef7f6' 
  AND token = 'SYSszreQxrsqNZwg4KRIy2gcfdK6jBe3coAvUTcH+eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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