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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6770d41af653e0072ee0f9acb382e6919ed4c4ec69eb405dde76ea8724af62' 
  AND token = '1ud7ZvNqTmX2u/Y5mrk+LkuuTGJumwbucAQ8lx+VApQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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