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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1f9a5afd156ecd203c09b8f7b2b3e4594275de8db6bedb2d26676f34ae8fed' 
  AND token = 'eNAzNYvC8RysVVLpIFLlePrF0PSTO95TB3bVaE5aIoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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