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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4976b469089918822545e8c77c51175edd147ff557e9e551b629ede4963b1d49' 
  AND token = 'uwpnTj2lrn2+oT+8jUjuZUW8oIapbLWwZ9uocF55jUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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