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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d46c2a48d54a28bca3cb0ada9c6b27fd4254afc8de8e2f3615ca1ecf9576c56' 
  AND token = 'fvBtDCPDy7ml1mT+AJjicPtIw/97OFG+KcfGD12+GzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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