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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfd33ec3a70c1d497ccfe4539d624e253523064dd598270cf1181c030fe4dc8' 
  AND token = 'vVi7/gf/vKkB8je2et2WCJ6qbp3WzC7qD8qA7BQJTxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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