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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf42067e228c7d579c25d499c5bc2027f93c62d44fa15a92c86fc27450d8230' 
  AND token = 'UTkUu1Y5M8MGZHjXKQnp6mo2DBwjRBLN6YdztY9CemM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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