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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5721a627fc5b1a854ed7635fba63e3f316a80cac9ab57b9d2ed45a2f45c194cd' 
  AND token = '7659PkffAczpwIolX5PAZydH6YkhHQs9J+d9sBDrPLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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