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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b099cdefa2af911b92b734e13dce9782d7fc7292c9a5a78126f25d91830b6c39' 
  AND token = 'HxUppw2dP18c29vkt8tVICgbCK/h8mYJx5jfycA2S5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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