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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25491c40d5efa9f28af8822c07405497db49a669b5ed9aea407914e4b8de15f3' 
  AND token = '3G/taON2clVZsXDSivYYP947CaEq+bTP5xBS2qx9sPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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