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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8613b5680eeb52b058041f2eb35b4cd478dca7d8d353d0615e384fd943b4d744' 
  AND token = '6/zqBO8fg9LX0PoXMg46U46UV3slHh/jtfNhI/FAQ6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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