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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac562b7668945e112a2055d9b3abda2b6e12947e50da0dae9ef753403923d52' 
  AND token = 'd6zXlkJu2tYEepnP1eOcy1VDOu7fPkU5pzAC792y0pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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