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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88118cb08c8810d8767ed1af43bd9e44e5d0d1671e782eb693638a37e7d69a9f' 
  AND token = 'NQ/Gga+dI81OqV820NpMOClLWpAE0IWDPoWKbGDCNp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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