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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93919fdac501a674523d004c8b163039af9817c5b6f1a2c5c607243736a8e809' 
  AND token = '9vZL22ZYG909InyZgX/att3mlct6zc1c069F6oETMy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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