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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c5c9a66cde627f8b9f96f2dab9dec18fa650ddc4f8ed5ce9b7a1abd4e132e4d' 
  AND token = '5Bx/Qeemugr8RX7mehwqlaC85Eha5KRkGm8EM3UxGsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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