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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30e6ef03b79853f7343d74ddb1546e004e10ea5ae5be97394c5a333c1406b46' 
  AND token = 'cI/vhP70rUzYFOpozkP50EgfmCOo+5aiHM5bcLJhoEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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