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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204f8608fbbc0c59228c5e970352c7ea9767758033e27db02dd34dd78d7c9480' 
  AND token = 'iA/zLV8Lnt9omQJSXphdJLHPaFqPELvlVayeCDyu5ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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