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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8efce393cf6d01c3442a1732d712bcdc048811410a0b9b58f116944232f2788' 
  AND token = 'rAjb1ItKDHP+OXnh2ktIoOHnpQP8UYzULO2aiKSfFus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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