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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5286c9ed360883289adb2132e90837476166b494c321d3476742287a5e32ad10' 
  AND token = '+vId8hLzVHkpUBOM0ZoU6nIIUNXq1zNdI4GOUALxPTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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