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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d097e3d86bffc72376dd65822dc3ce9e22c22e9767baba62fc12d30fcd5d68' 
  AND token = 'g5MHFyRMipEYjEt0NMshRZ9pB056tfFJbYL5qvI+ffs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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