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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc199114c6032944b1c52b6b8473b6a04943432e9a86d4d846e36ba72a2f483d' 
  AND token = 'Ii+euyIf+et49qJKb2d3ennwmOBMvImQqJ6aAd7nYc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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