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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b70c331b341355cb27a590002ab9a26811fe0d0a7fb53cdd5d820a3d3fad8fc' 
  AND token = 't4Y5TmJSSV4mWfIYNwg3RuQ/v7iR/lIGXZGiJHTAtno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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