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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68721db3b44a5d0dc30c4ddb97fd3563a95bee8b99d5c9260770be97f8f707a' 
  AND token = 'egoL/vGGCt9n7ibMCITXslIVIJFcq/Ac/qqIldts9fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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