SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55ab160c1b6caa3c9d55c1fe4555cab27164621ac8c3d3d2c946f46de04c9ca' 
  AND token = 'Br0+LKmQZwzwCBRLBUfjYUK9RJmgo2P2vd/LeH8FTkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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