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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33fdf542a58e5f0cdc3cfc1f298d8ea6efbfe699a3976775f0e08dc4b562fd3e' 
  AND token = 'Xv93ofOE5L39rP6qr/0pfFS7mZyEeuLoBdJqa61Pu2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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