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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afe4918cb6fe03d259bf9bff5ed983dff71b6e8735f8ba87a0fdd9dbc87cbb6' 
  AND token = 'sTrYVmle/XV1Pbb/CO2cSWCStQGU4et3hXFaa2laGJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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