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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0fbde6c4789a8454fc245e31cad095cdc66b8da02aaa9ad339becf3c74e6b9' 
  AND token = '7Yjo2gr5WT/bEhW/rsDpRpfsVnNfJM+3qoo/J9GCJl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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