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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1830c3083d2a600839d178c6501ad4e1a21fbdb9a67e28a651870c1adf0ac2a3' 
  AND token = 'N4FYGyYYb2d9dRrOa0/PjUplm8YE6XZGu38RZYxJkbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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