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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dae547dce933dacb37f4ee4bc5944d29750d31588c9971c9f3425e6119af63f' 
  AND token = 'PVRjvzHsksVUL9W1L5vcRxW9MWHvHv0V43CU1JgmCqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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