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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a541e9db29c806cec2f0a105f0ae11c6a6c98d7057b9fd55eb89bf9a12258a' 
  AND token = 'iibzfnuGun8bIz9lIbRa6UDE5rrCHyt7jcDS1vD3/Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00506

JSON explain

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