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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7cc97040e1204a2e959ecbc600b86fe804b77b6c0892fc3631eda63e7dd6f1' 
  AND token = 'uPc03OeU2xYA/morwB9NfJHybdrXRxR93+rzXGGlf1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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