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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5cece7bd904d6a3455db2143e985146faf6f2558e01da66375eec33b794754' 
  AND token = 'wa4QNcGRw/RfbYymthHqnE5nIyfZ1NnSGuME324jo+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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