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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc19c44691edf0282d3a439258bf4f99a829988034c90780b175e0d174ab4860' 
  AND token = 'dhCwfcKkplfhgCPvNQ4y6eKv9yW42jgoUQco3zUZhek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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