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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cd25b39ddacdbd473a05f6b99306be3658bbf49a3c5cdef16f5860bb97bd27' 
  AND token = 'PzTj0ixFhF4uWX5GL0lqQZ8WO9JU0DFwl2NZ7N6pLIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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