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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d13b45e66479bb39435409ed8a11c7ca7c713db05264043569044bc34d1160' 
  AND token = 'Mqih6pRsll7y35BtY/EyIObiXB3K5pb2bVn71GurXaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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