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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cb02e0ef8ba630b2f6c006c9f585711f780f1aedb781eab06d6b9f161445eb' 
  AND token = 'GBeiMfWqMmQu+RMk3eddjZbX7jBKgHal243bRmAiS54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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